Sections

Ecological Land Types within LTA 176.

ELT 176a

Elevation Range
Minimum: 
1012 m
Minimum in ft: 
3321 ft
Maximum: 
1112 m
Maximum in ft: 
3648 ft
Median: 
1065 m
Median in ft: 
3494 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very gravelly fine sand to clay loam surfaces with extremely gravelly sand to clay loam layers below, depth and distribution of lime varies, no or little development (relatively recent alluvium); this unit is dominated by Pima County map unit 5 (Arizo-Riverwash complex, 0 to 3 percent slopes), 68 (Riveroad and Comoro soils, 0 to 2 percent slope), and 19 (Comoro sandy loam, 0 to 2 percent slopes) which comprise 51%, 30% and 9% of the ELT
Geologic Materials: 
dominated by Cienega Creek channel deposits and Holocene terraces (Qyr) and Davidson Canyon channel deposits and Holocene terraces (Qycr) which comprise 72% and 5% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised alluvial terraces and floodplain

ELT 176b

Elevation Range
Minimum: 
974 m
Minimum in ft: 
3195 ft
Maximum: 
1018 m
Maximum in ft: 
3340 ft
Median: 
994 m
Median in ft: 
3261 ft
Soil Summary: 
very deep, textures vary widely and soils are often stratified – very gravelly fine sand surfaces with extremely gravelly sand layers below, lime throughout, no or little development (relatively recent alluvium); this unit is dominated by Pima County map unit 5 (Arizo-Riverwash complex, 0 to 3 percent slopes) which comprises 97% of the ELT
Geologic Materials: 
dominated by Cienega Creek channel deposits and Holocene terraces (Qyr, Qyc); Cienega Creek middle to late Pleistocene terraces (Qir); and late Holocene deposits in active stream channels and low terraces (Qy2) which comprise 68%, 16% and 5% of the unit, respectively
Landforms: 
undissected to coarsely dissected, weakly incised alluvial terraces and floodplain

Catalina